TITLE: GCN CIRCULAR NUMBER: 39302 SUBJECT: GRB 250205A: Calapai Observatory, Massa S. Giorgio (Messina), upper limit DATE: 25/02/12 17:38:07 GMT FROM: Giovanni Calapai at Calapai Astronomical Observatory, Massa S. Giorgio, Messina, Italy <giovannicalapai@tiscali.it> Giovanni Calapai at Calapai Astronomical Observatory, Massa S. Giorgio, (Messina) Italy Member of: GRB/UAI Gamma Ray Burst Section of Unione Astrofili Italiani. Report: We imaged the field of GRB 250205A detected by SVOM/ECLAIRs telescope (Saccardi et al. GCN 39154), with the 11 inches Schmidt-Cassegrain (Celestron 11) telescope F/D=6,3. The observations were started at 2025-02-05 23:12 UT (approximately 1.79 hours after burst) stacking a set of unfiltered CCD image. The observations were carried out with clear skies and good visibility conditions. We co-added 183 exposures of 60 sec each. Start T0+ End T0+ CR lim 1.79 hour 5.88 hour 20.2 We did not found any optical counterpart in the error box of the XRTcandidate. Kennea et al. GCN 39161 Magnitudes were estimated with the PanSTARRS cat. and are not corrected for galactic dust extinction. Our observations are consistent with other already reported Gompertz et al. (GCN 39156), Schneider et al. (GCN 39157), Gompertz et al. (GCN 39158), Palmerio et al. (GCN 39159), A. de Ugarte Postigo et al. (GCN 39160), Watson et al. (GCN 39162), Breeveld et al. (GCN 39168), Busmann et al. (GCN 39169), Ferro et al. (GCN 39170). The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/39302. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...